Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Derivative Financial Instruments - Additional Information (Detail) - USD ($)				4 Months Ended		12 Months Ended
	Aug. 08, 2016	Aug. 05, 2016	Mar. 28, 2012	Apr. 21, 2018	Apr. 22, 2017	Dec. 31, 2016	Dec. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Cash settlement on hedge	$ 1,000,000	$ 1,000,000	$ 3,100,000
Hedge ineffectiveness				$ 0	$ 0
Derivative instrument, asset				1,056,000			$ 16,324,000
Derivative instrument, liability				$ 900,000			$ 0
Selling, Distribution, and Administrative Expense
Derivative Instruments, Gain (Loss) [Line Items]
Hedge ineffectiveness						$ 100,000